25 terms

# Pearson Chapter 2 Forces

Review of Chapter 2 in Motion Forces and Energy book

#### Terms in this set (...)

force
This is a push or a pull.
newton
This is the SI unit that measures the strength of a force.
net force
This is the combination of all the forces acting on an object.
unbalanced forces
These are the forces that cause an object to start moving, stop moving or change direction.
balanced forces
These are equal forces acting on an object in opposite directions.
friction
This is the force that two objects exerton each other when they rub against each other.
static friction
This is the type of friction that acts on objects that are not moving.
sliding friction
This is the type of friction that occurs when two solid surfaces slide over each other.
rolling friction
This is the type of friction that occurs when an object rolls across a surface.
fluid friction
This is the type of friction that occurs when a solid object moves through a fluid.
gravity
This is a force that pulls objects toward each other.
Mass
This is a measure of the amount of matter in an object.
Weight
This is the measure of gravitational force on an object.
free fall
This occurs when the only force acting on an object is gravity.
air resistance
This is a type of fluid friction that happens to objects falling through air.
terminal velocity
This is the greatest velocity that a falling object reaches.
projectile
This is any object that is thrown.
inertia
This is the tendency of an object to to resist change in motion.
Newton's first law of motion
This is the law of inertia.
Newton's second law of motion
Acceleration = net force divided by mass
momentum
Momentum = Mass x Velocity
Law of Conservation of Momentum
In the absence of outside forces, the total momentum of objects that interact does not change.
satellite
This is any object that orbits another object in space.
centripetal force
This is any force that causes an object to move in a circular path.
Newton's third law of motion
For every action there is an equal and opposite reaction.